HNB2L-63 3P+N RCCB | 63A Residual Current Circuit Breaker

This is a three-phase, four-pole RCCB rated 63 A, used to protect three-phase installations against earth leakage. It is typically the main residual-current protection device in commercial panels, small workshops, machinery supply, pumps, elevators and three-phase residential services. It cuts L1, L2, L3 and N together on detecting an imbalance.

A 3P+N RCCB is intended for three-phase four-wire systems, nominally 400 V between phases and 230 V phase-to-neutral at 50/60 Hz. This lets it protect a mixture of three-phase loads (motors, compressors) and single-phase 230 V circuits fed from the same distribution board. Check the nameplate rated voltage (Ue) for the specific variant.

The 1P+N version covers one phase plus neutral for single-phase circuits, while the 3P+N version covers three phases plus neutral for three-phase systems. They share the same 63 A rated current and residual-current sensing principle, but the 3P+N is wider on the DIN rail and must be sized to the three-phase load balance of the installation.

Yes. Like all RCCBs, it provides only residual-current protection and cannot interrupt overloads or short circuits. An upstream MCB or MCCB (or a group of downstream MCBs) must provide overcurrent and short-circuit protection, coordinated so the upstream device discriminates in time during a fault.

Three-phase RCCBs are commonly offered in 30 mA (personal protection for socket circuits), 100 mA and 300 mA (fire protection / upstream discrimination). For three-phase industrial loads with inherently higher leakage (motors, VFDs, long cable runs), a higher sensitivity or a selective type may be chosen to avoid nuisance tripping.

It depends on the type. Standard Type AC is not suitable for variable-frequency drives, which can inject pulsating or smooth DC leakage; choose Type A for pulsating DC, or Type F/Type B for VFD, inverter and EV-charging loads. Always match the RCCB type to the load electronics, otherwise nuisance tripping or, worse, failure to trip can occur.

Mount on a 35 mm DIN rail. Connect supply L1, L2, L3 and N to the upper line terminals in the marked positions, and the corresponding load conductors to the lower terminals. All four conductors must pass through the device's sensing window; do not bypass the neutral, and keep downstream neutral bars separate per RCCB group. Use cable lugs where required and torque to the manufacturer's specification.

This is often due to high capacitance leakage in long motor cables, EMC filters in variable-speed drives, or inrush-related DC component. Verify whether the RCCB type matches the load (Type A/F/B) and consider a higher sensitivity rating or time-delayed (Type S) unit upstream. Never simply short-circuit or bypass the test function to stop nuisance trips.

Choose poles by the supply type (3P+N for three-phase four-wire). Choose 63 A if the total downstream load fits within that current. Choose 30 mA where people can touch sockets or equipment, and 100–300 mA upstream for fire protection. For discrimination between multiple RCCBs, use a time-delayed (Type S) upstream unit and instant downstream units.

Press the local "T" test button monthly; it should trip instantly with power applied. A qualified electrician should periodically use a calibrated RCD tester to verify the operating residual current and trip time on all combinations. Because three-phase systems are more sensitive to neutral cross-connections, also verify neutral isolation between groups during periodic inspection.